Fuse plug



T. F. COTE FUSE PLUG Original Filed April 26, 1921 Patented Dec. 23,1924.

UNITED STATES THOMAS F. COTE, F MONTREAL, QUEBEC, GANADA.

rusn mm.

Application filed April 26, 1921, Serial Ho. 464,52t. Renewed May 1c,1925.

- To all whom it may concern."

Be it known that l, THOMAS F. Corr, a subject of the King ofGreatBritain, residing at Montreal, in the Province of Quebec and Dominion ofCanada, have invented certain new and useful Improvements in'f usePlugs; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will ,enable others skilledin the art to which it appertains to make anduse-the same.

This invention relates to new and useful improvements in fuse plugs ofthe character set forth in my Patent No. 1,424,714 and has for itsprimary object the provision of means for closing the ends of theinsulating sleeve which permits easy and quick removal of a burnt ordestroyed fuse and the replacement of another in lieu thereof and alsoestablishes an eficient electrical connection between the fuse contactand the ferrule.

Another object of this invention is the provision of grooves arranged inthe closing means of the sleeve for the purpose of permitting thegradual escape of fumes or gases from the body to the atmosphere causedby the burning or fusing of the fuse and said grooves preventing thedirect escape of flame from the body to the atmosphere, consequentlyreducing fire.

A further object of this invention is the provision of means forindicating when the fuse is destroyed and also adapted to indicate theamperage of the fuse and further to retard the entrance of foreignmatter to the interior of the'loody.

A still further object of this invention is the provision of a fuse plugof the above stated character, which will be simple, du rable, andeflicient, and which may be manufactured and sold at a comparatively lowcost.

With these and other objects in view as will become more apparent as thedescription proceeds, the invention consists in certain novel featuresof construction, combination,

and arrangement of parts as will be hereinafter more fully described andclaimed;

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings in which Figure 1 isa vertical sectional view illustrating a fuse plug constructed inaccordance with my invention, a

Figure 2 is a ver ical sectional view illustrating the cover with theferrule located therein,

Figure 3 is a perspective view illustrating the sleeve with the closurecaps applied I thereto,

Figure 4 is a perspective view illustrating a modified form of cap.

Referring in detail to the drawings, the numeral 1 indicates a bodyconstructed from porcelain or any other material suitable for thepurpose and is provided with a ch'amber 2 and one end of the body isclosed by an end wall 3 provided with a centrally arranged opening 4; toreceive a contact 5 that projects slightly beyond the outer face of theend wall as clearly shown in Figure 1. The contact 5 consists of ahollow body 6 that has its outer end closed and its inner end has formedintegrally therewith a flange 7 adapt- 5 ed to seatagainst the innerface of the end wall 3. a The. other end of the body 1 is opened andclosed by a removable cover 7 constructed from porcelain or any othermaterial suitable for the purpose and said cover has seated therein aferrule 8, the side walls of which have pressed therein screw threads 9adapted to cooperate with screw threads 11 formed within the cover 7 andalso adapted to cooperate with screw threads 12 formed on the body 1 todetach ably secure the cover 7 to the body. The screw threaded wall ofthe ferrule 8 pro- I jects beyond the side wall of the cover 7' andoverlies aportion of the body and is co adapted to have threadedconnection with the usual fuse socket (not shown). The cover 7 isprovided with a centrally arranged vent opening 13 in its top wall andalines with a vent opening 14: formed in the ferrule 8.

Aninsulating sleeve 14 is arranged within the chamber 2 and spaced fromthe wall thereof and has its ends closed by closure caps 15 of cu -shapeand the s1de walls thereof are slig tly flared outwardlyas illustratedat 16 at their edges for facilitating opening 18 for the purpose ofpermitting fumes or gases within the interior of the sleeve to escapeinto the body on the burnferrule 8. The ferrule S is constructed from asuitable metal.

- 14 and the interior of the body. The caps- 15 have pasted or otherwisesecured thereto The closure caps 15 have a plurality of radiallyextending grooves 19 pressed in their outer faces and the grooves'of onecap establish communication between the vent disks 20 hearing theamperage of the fuse and of a size substantially equal to the size ofthe vent opening 14' and one of said disks, depending on which cap isdisposed uppermost, is adapted to close said vent opening. The disksalsoclose the inner ends of the grooves 19, thus it will be noted that thegrooves as well as the ventopening 14' are closed by said diskpreventingthe entrance of foreign atter into the chamber 2. The disks are consucted from paper or any other material which is readily destructible byfire andthe disks are pasted or otherwise secured onto the respectivecaps.

The destruction of the fuse 17 by an overcharge of electricity, causesthe same to burn out and create a certain amount of flame and gaseswhich escape into the chamber 2 whence they may expand into the interiorof the contact 5 and also gradually escape from the chamber 2 by way ofthe grooves in the uppermost cap and the vent openings 151 and 13respectively. The disk 20 being of a fragile material will quicklybecome destroyed or mutilated by the flame and gases as they escape fromthe chamber 2 and thereby indicate that the fuse has been destroyedwithout the necessity of removing the cover 7 and ferrule 8 from thebody in order that the uppermost cap 15 may be removed from the sleevein order to expose the fuse.

As shown in Figure ,4 the disk 20 may be dispensed with and the amperageof the fuse may be stamped or otherwise applied directly to the caps.

The contact 5 being of hollow formation allows the gases entering in thechamber 2 from the sleeve 14 to expand into the same whence said gasesmay gradually escape back into the chamber and thence out to theatmosphere by way of the vent openings 13 and 14 and the grooves in theuppermost cap. The body 6 of the contact 5 being of hollow formationalso permits the flange '7 to be easily formed by simply bending orstamping a portion of the body laterally.

While I have shown and described the Having thus described my inventionwhat I claim 1s 11A fuse plu comprising a body, a fur-.

rule for said he y and having a vent, a contact for said body, a sleevein said body and having an opening, a fuse in said sleeve, and capsclosing the ends of thesleeve and securing the fuse to the sleeve andengaging the contact and the ferrule at the vent, said caps havinggrooves and the-grooves of one cap establishing communication betweenthe vent and the interior of the body.

2. A fuse plug comprising a body, a ferrule for said body and having avent, a contact for said body, a sleeve in said body and having anopening, a fuse in said sleeve, cup-shaped caps closing the ends of thesleeve and having frictional contact with the latter and securing theends of the fuse to the sleeve and engaging the ferrule and the contact,said caps having grooves and the grooves of one cap establishingcommunication between the interior of the body and the vent.

3. A fuse plug comprising a body, a. ferrule for said body .and having avent, a cover carried by said ferrule and having a vent in alinementwith the first named vent, a contact for said body, a sleeve in saidbody and having an opening, a fuse in said sleeve, caps closing the endsof the sleeve and having grooves therein, said caps engaging the ferruleand .contact and the grooves of one cap establishing communicationbetween the vents and the interior of the body.

4. A fuse lug comprising a body, a ferrule for said body and having avent, a contact for said body, a sleeve in said body and having anopening, a. fuse in said sleeve, caps closing the ends of the sleeve andengaging the ferrule and the contact, said caps having radiallyextending grooves opening outwardly of the peripheries of said ca andhaving their inner ends relative y spaced, the grooves of one capestablishing communication between the interior of the body and thevent, and. destructible means closing the vent and grooves.

5. A fuse plug comprising a body, a ferrule for said body and-having avent, a contact for said body, a sleeve in said body, a fuse in saidsleeve, caps frictionally engaging said sleeve and engaging the ferruleand the contact, said sleeve having an opening, said caps having grooveswith their nner ends relatively spaced and disposed I th body,destructible disks bearing the amperage of the fuse secured to'the capstact carried by said body' and having a hollow body on said body, asleeve in said body, a fuse in said rtion, an integral flange formedsleeve, caps closing said sleeve and one of said caps resting upon theflange andthe other cap engaging the ferrule, said sleeve havin anopening, said caps having grooves establlshing communication betweenthe.body and the hollow body portion of the contact and the interior of thebod "and the vent, and destructible means 0 osing the grooves of'thecaps and the vent.

7. A fuse plu comprising a shell having a vent, a vente fuse containingelement in said shell with one end abutting the latter about the ventprovided with passages ody portion and engaging the to establishcommunication between thein- 'terior of the shell and the vent.

having closed ends located in said shell with one end engaging thelatter about the vent and having grooves in said last named end toestablish communication'betweenthe vent and the interior of the shell.

9. fuse plug comprisingsa shell having .a vent, a vented fuse containingelement having closed ends located in said shell with one end engagingthe latter about the vent and having grooves in said last named end toestablish communication between the vent and the interior of the shell,and de; 40 l I structible means closing the grooves and adapted to bearthe amperage of the fuse.

' In testimony in presence of two witnesses.

I THOMAS F. COTE. Witnesses:

Nn'rm E. WEEKS:

whereof. I afiix my signature"

